Strength Analysis Of U-shaped Cars For Dump Trucks

The dump truck car is mainly composed of a bottom plate,a side plate,a front plate,a rear plate,a lifting support,a flip support and various ribs.As the direct contact with the loaded materials,the strength of the car directly affects the performance of the car and affects the safety and service life of the dump truck.A special-purpose automobile company in China has developed a dump truck U-shaped car box,which uses Hardox 450 high-strength wear-resistant plate material and has good mechanical properties.This paper mainly uses the combination of experiment and simulation to study the structural strength of the dump truck U-shaped car.The finite element analysis model of the car is built in the finite element analysis software HyperMesh.The car box is meshed by the combination of the shell unit and the solid unit,and the welding part of the car is simulated by the spot welding unit.Through the free modal analysis of the car,the natural frequency and vibration mode of the car box are obtained.The load of the car is calculated by the Rankine active earth pressure theory,and the structural strength analysis is carried out for the full load and lift conditions of the car.The analysis results show that the maximum stress of the car in the full load condition and the lift condition does not exceed the yield limit of the Hardox 450 high strength wear plate.In order to verify the correctness of the finite element model of the car structure and the accuracy of the simulation results,a vehicle strain electric test system was established,and the test points were arranged reasonably to obtain the stress values at each measuring point.The comparison between the calculated values of the finite element and the experimental values of each measuring point shows that the relative error is 1.37%~19.32%,which proves that the finite element model of the built car is correct and can be used for the structural strength analysis of the car.The research results of this paper can provide reference for the further improvement of the U-shaped car of the dump truck.